The 2GIG-ANT5XL-GC3 is an external attic-mount cellular antenna that works with the 2GIG GC3 control panel. The 2GIG-ANT5XL-GC3 antenna offers flexible mounting options to optimize the cellular signal reception at an install. It has the ability to rotate to face the closest cell tower and/or keep the antenna away from devices that may be the cause of the signal interference. Adding the 2GIG-ANT5XL-GC3 is a great option for anyone looking to improve the LTE reliability and signal strength.